I was reading this post on Reception Ideas:
It's late to respond to that post, so I was going to through out my two cents here.
In my opinion, you should have a seating chart at a wedding for many of the reasons listed in that post. I saw a lot of ladies respond that they have been to weddings without seating charts and it wasn't chaos. I thought this too until I went to a wedding where it was chaos for me. I've been to plenty of weddings without seating charts and it never seemed to be a problem. Then I went to my SIL's wedding. Dh (at the time BF) was a groomsman and of course WP dates had to fend for themselves. I didn't really know anyone at the wedding (we hadn't been dating that long) and the lack of a seating chart was a nightmare for me. I had no idea where to sit and my MIL was trying to help me, but every time I went for seat, someone else got it before I could reach it. There were a few other problems I noticed, but I guess my point is that even if the seating seems fine for you, the lack of a seating chart is probably chaos for a few people at every wedding.
My Grandparents on their wedding day.
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Repeat this to your self: My Wedding Party is made of my family and friends and I should treat them as such.